644629324 has 12 divisors (see below), whose sum is σ = 1194460344. Its totient is φ = 303354944.

The previous prime is 644629291. The next prime is 644629331. The reversal of 644629324 is 423926446.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4739854 + ... + 4739989.

It is an arithmetic number, because the mean of its divisors is an integer number (99538362).

Almost surely, 2^644629324 is an apocalyptic number.

It is an amenable number.

644629324 is a deficient number, since it is larger than the sum of its proper divisors (549831020).

644629324 is a wasteful number, since it uses less digits than its factorization.

644629324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9479864 (or 9479862 counting only the distinct ones).

The product of its digits is 248832, while the sum is 40.

The square root of 644629324 is about 25389.5514729977. The cubic root of 644629324 is about 863.8467145619.

The spelling of 644629324 in words is "six hundred forty-four million, six hundred twenty-nine thousand, three hundred twenty-four".